With the signing of the Dayton Peace Accord in December 1995, NATO immediately deployed an UN-mandated Implementation Force (IFOR) comprising some 60,000 troops. This operation (Operation Joint Endeavour) was followed in December 1996 by the deployment of a 32,000-strong Stabilisation Force (SFOR).
In light of the improved security situation, NATO brought its peace-support operation to a conclusion in December 2004 and the European Union deployed a new force called Operation Althea. The Alliance has maintained a military headquarters in the country to carry out a number of specific tasks related, in particular, to assisting the government in reforming its defence structures.